20004304291021 has 2 divisors, whose sum is σ = 20004304291022. Its totient is φ = 20004304291020.

The previous prime is 20004304291007. The next prime is 20004304291067. The reversal of 20004304291021 is 12019240340002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16338653252100 + 3665651038921 = 4042110^2 + 1914589^2 .

It is a cyclic number.

It is not a de Polignac number, because 20004304291021 - 2¹¹ = 20004304288973 is a prime.

It is a super-2 number, since 2×20004304291021² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20004304298021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10002152145510 + 10002152145511.

It is an arithmetic number, because the mean of its divisors is an integer number (10002152145511).

Almost surely, 2^{20004304291021} is an apocalyptic number.

It is an amenable number.

20004304291021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20004304291021 is an equidigital number, since it uses as much as digits as its factorization.

20004304291021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 28.

The spelling of 20004304291021 in words is "twenty trillion, four billion, three hundred four million, two hundred ninety-one thousand, twenty-one".